A type of character, action, or situation that occurs over and over in literature; a pattern or example that occurs in literature and life. Example: The emperor himself was an archetype of what the modern world calls a constitutional monarch; he reigned, but did not govern.
Automator is an application developed by Apple for OS X that implements point-and-click (or drag and drop) creation of workflows for automating repetitive tasks into batches for quicker alteration, thus saving time and effort over human intervention to manually change each file separately.
Automator is so flexible that it's impossible to give a complete summary of how it works, but here are some of the basics. You use Automator to create an app that performs exactly the series of steps that you want it to perform. Each step gets performed by a kind of building block called an Action; the full sequence of steps is called a Workflow.